US Bridges

Tunnel Stream Road over Tunnel Brook

Fair

Grafton County, New Hampshire · .7 MI FR Easton Tl · Structure no. 002201450015600

Built
1928
97 years old, rebuilt 1992
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
2 main spans
Daily traffic
52
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tunnel Stream Road over Tunnel Brook is a steel stringer/multi-beam or girder carrying Tunnel Stream Road over Tunnel Brook in Grafton County, New Hampshire. It was built in 1928 and reconstructed in 1992, so it is 97 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 52 vehicles a day, projected to reach 76 by 2043. The structure is 74 ft (22.6 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesTunnel Stream Road
CrossesTunnel Brook
Location.7 MI FR Easton Tl
CountyGrafton County
StateNew Hampshire
Coordinates44.07412, -71.83611
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating71 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length74 ft (22.6 m)
Longest span34 ft (10.4 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52 (2023)
Projected traffic76 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tunnel Stream Road over Tunnel Brook built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1992.

What condition is Tunnel Stream Road over Tunnel Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does Tunnel Stream Road over Tunnel Brook carry?

About 52 vehicles per day (2023 count).

How long is Tunnel Stream Road over Tunnel Brook?

The structure is 74 ft (22.6 m) long with a longest span of 34 ft (10.4 m) and a deck 25 ft wide.

Who owns Tunnel Stream Road over Tunnel Brook?

It is owned by the City or Municipal Highway Agency.